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Abstract

Yb2+ and Yb3+ co-activated luminescent material that can cut one photon in ultraviolet and visible region into multi NIR photons could be used as a downconversion luminescent convertor in front of crystalline silicon solar cell panels to reduce thermalization loss of the solar cell. After a direct excitation of Yb2+ ions, an intense Yb3+ luminescence is observed based on a cooperative energy transfer process. The energy transfer process is discussed according to the dependence of Yb3+ luminescence intensity on the excitation power and the ambient temperature.

Figures (5)

Fig. 2 Absorption spectra for sample A0, A, B0 and B. Inset: Curves 1 and 2 are the difference absorption spectra between sample B and B0, and between sample A and A0, respectively. Curve 3 is the difference absorption spectrum between curve 2 and curve 1.

Fig. 3 Emission spectra in the near infrared region under excitation at 310 nm for sample A and A0, and under excitation at 275 nm for sample B (solid lines in red, blue and magenta). Excitation spectra of Yb3+ monitored at 978 nm of sample A (red dashed line) and B (blue dashed line).